I would have guessed that when RECEIVE creates a target data set, it would 
use the blocksize of the TRANSMITted data set.  Are you seeing some other 
behavior?
I would also guess that if you RECEIVE into a data set that you have already 
allocated, which has a block size in the DSCB, RECEIVE shouldn't change it.

  I do know that TRANSMIT and RECEIVE hardcode BLKSIZE3120 in their DCBs for 
the log data set.  That really irked me several decades ago, and I showed the
owners at the time how to fix that, but they refused to do it.  Of course, they 
are all long gone from IBM now so I suppose I could just do it myself if I ever 
get around to it.
I did change TRANSMIT and RECEIVE from 24-bit to 31-bit addressing mode in z/OS 
3.2 so that they could access ASCBs in 31-bit storage.

  Jim Mulder

>No, that is not the issue I have.  We are receiving large XMIT datasets from 
>an ISV
>which require large amounts of DASD, greater than a 3390-9.  If the XMIT 
>datasets
>used SDB, the space requirements would be greatly reduced (I reblocked them 
>after
>they were staged).


Jim Mulder z/OS Diagnosis, Design, Development, Test  IBM Corp. Poughkeepsie NY

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